Sunderland confirmed on Tuesday that the Black Cats assistant boss had left the League One club.
Lewis Morgan shone under new Hibs boss Ross at Sunderland and St Mirren - and the Celtic benchwarmer needs game time in the Scottish Premiership.
Sunderland's old boss recently made the same move to Hibernian.
Dylan McGeouch joined Sunderland in the summer of 2018 after leaving Hibernian.
Sunderland brought Jack Ross to the Stadium of Light in 2018 but he was sacked by the Black Cats last month.
Hibernian announced Ross as their new manager on Friday, little more than a month after he was sacked by Sunderland.
Fowler worked under Ross at St Mirren and Sunderland.
Ross is set for a swift return to football with Hibernian, after being sacked by Sunderland last month.
Sunderland have fallen from the Premier League to England third-tier in a pretty short space of time.
The 'sacked' Hibernian manager used to play for Sunderland.
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